Help with wiring an external light

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I want to wire an external light with a new switch. The rose on the lamp has a single 3 terminal block. I will fix the lamp to eaves overhanging the door. There is plenty of access to the existing internal lighting main in the attic eaves space above the position of the new lamp. What is the best method of wiring in the lamp and switch?
 
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Take the LNE feed from the attic down to the light fitting, connect the N and E.

Put the L on a choc terminal and run that via another TE cable down to the switch.
The other core of the cable then goes from the swithc back to the light as the switched live.

LNE- Live, Neutral and Earth
 
OK. Just to make sure I've got this.

1. Take a feed from an existing rose in the attic to the light fitting.
2. Connect N & E to corresponding in the 3 terminal block.
3. Connect L to a new choc terminal.
4. Run a TE cable from the new switch to the light fitting.
5. Connect one core to choc terminal.
6. Connect the other core to L on the 3 terminal block.
 
OK. Just to make sure I've got this.

1. Take a feed from an existing rose in the attic to the light fitting.
2. Connect N & E to corresponding in the 3 terminal block.
3. Connect L to a new choc terminal.
4. Run a TE cable from the new switch to the light fitting.
5. Connect one core to choc terminal.
6. Connect the other core to L on the 3 terminal block.

Not quite what Chris said...
 
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OK. Just to make sure I've got this.

1. Take a feed from an existing rose in the attic to the light fitting.
2. Connect N & E to corresponding in the 3 terminal block.
3. Connect L to a new choc terminal.
4. Run a TE cable from the new switch to the light fitting.
5. Connect one core to choc terminal.
6. Connect the other core to L on the 3 terminal block.

Yes correct
You also need to connect the earth for the switch cable too.
 
Plan B:

Run a T/E cable from the existing lighting circuit to a double pole switch, and a T/E cable from there to the light.

That way if water gets into the light and causes a N-E fault the switch will isolate it completely and you won't get RCD tripping problems.
 
I haven't got round to doing this yet but when I have I'll post a reply to let you know how I got on.

:)
 

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